Be very careful with the guy outside the clothes shop - he is very cunning. he knows that when you first change money there you will take care to check, and so he makes sure that he gives you the correct amount the first few times. However, he also knows that once he has 'proved' how honest he is - hence the use of a calculator, he knows you will be more relaxed, and then he will look for an opportunity for 'the sting' usually when the calculation is complicated - beware especially is he asks you for a small amount of lira. I almost got caught out, despite the fact that my day job is teaching statistics! When I challenged him he tried to fob me off, but I stood my ground, the smiles disappeared, face became red, and he got very angry. Eventually he gave in and threw the amount he tried to cheat me out of on the counter. Now he gives me a wary look when I walk past...